BS ISO 8332:2018 pdf free
BS ISO 8332:2018 pdf free.Rubber compounding ingredients一Sulfur 一Methods of test
Adjust the oil-bath temperature to 130 °C. Stir the contents of the flask for 1 h under reflux, and complete the reaction. If undissolved sulfur remains visible in the flask, continue the heating process as long as necessary. Wash the walls of the condenser with water and collect the washings in the flask.
Cool the contents of the flask to 25 °C. Transfer the contents of the flask to a 100 cm3 volumetric flask.Make up to the mark with water.
NOTE Reaction of 20 % oil-treated sulfur takes about3 hto 4 h.
Place exactly 30 cm3 of iodine solution (5.2.2) into a 200 cm3 conical flask from a burette, and add 10 cm3 of acetic acid (5.2.5) to it using a pipette.
Place 10 cm3 of test solution from the 100 cm3 volumetric flask in 5.3.1, using a pipette, into a 100 cm3 beaker. Add 2 cm3 of formaldehyde solution (5.2.4) and stir using a magnetic stirrer for 2 min.
After a 5-min rest, add the solution to the conical flask in 5.3.2. Wash the walls of the beaker and add the washings to the conical flask. While swirling the conical flask, add 1 cm3 of the starch solution (5.2.7) and titrate with the sodium thiosulfate solution (5.2.3) until the dark-blue colour vanishes. V1 is the volume,in cubic centimetres, of the sodium thiosulfate solution used for this titration.
Carry out a blank determination omitting the test portion. Vo is the volume, in cubic centimetres,of the sodium thiosulfate solution used for this titration.
Metal funnel (A), about 200 mm in diameter, terminating at the foot in a short cylindrical outlet (see Figure 1) in which is inserted a shallow removable cup (B), on the bottom of which a wire-cloth sieve (C) (6.2.1.2) is soldered; this is 25 mm in diameter. Water under pressure is supplied by a tube (D) fitted with a nozzle designed to discharge a spreading jet through the sieve; the distance of the orifice from the sieve can be adjusted. The recommended minimum water pressure is 200 kPa. The tube is provided with a filter (H) to remove any solid particles from the water; this filter shall be made from wire cloth at least as fine as the sieve (C), and shall be sufficiently large to prevent undue loss of pressure.A similar arrangement is provided for another tube (E) used to supply a gentle stream of water for wetting the powder and keeping the volume of the liquid in the funnel constant during the test.BS ISO 8332 pdf free download.
